"use strict";

const Promise = require("bluebird");
const assureArray = require("assure-array");
const defaultValue = require("default-value");

module.exports = {
	expression: function (func) {
		return func();
	},
	syncPipe: function (value, functions) {
		return assureArray(functions).reduce((last, func) => {
			return func(last);
		}, value);
	},
	asyncPipe: function (value, functions) {
		return Promise.reduce(assureArray(functions), (last, func) => {
			return func(last);
		}, value);
	},
	objectFind: function (object, predicate) {
		return Object.entries(defaultValue(object, {})).find(([ key, value ]) => {
			return predicate(value, key);
		});
	},
	objectIncludes: function (object, predicate) {
		return Object.entries(defaultValue(object, {})).some(([ key, value ]) => {
			return predicate(value, key);
		});
	},
	merge: function (... objects) {
		if (objects.every((obj) => obj == null)) {
			return null;
		} else {
			/* TODO: Eventually disallow conflicting keys? */
			return Object.assign({}, ... objects.filter((obj) => obj != null));
		}
	}
};